Its only factors are 11 and 1 because 11 is a Prime number
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11 = 1*11
As a product of its prime factors: 2*11 = 22. The other factor pair is 1*22.
The factor pairs of 66 are:66,133,222,311,6(1, 66)(2, 33)(3, 22)(6, 11)
There are 2 factor pairs of 55.55 = 1 x 5555 = 5 x 1155 = 1 x 5555 = 5 x 11(1,55)(5,11)
The factor pairs of 57 are 3x19 and 1x57